STUDY IN-SITU BY EXAFS ANALYSIS OF A REFO RMING CATALYST PTSN AL2O3-CL/

The knowledge of the platinum environment on bimetallic catalysts Pt-S n/Al2O3-Cl, when the catalyst is either oxidised or reduced, is necess ary in order to explain the catalytical properties. EXAFS gives charac teristics of platinum environment, even if the platinum content is low er than 0.5%. In this work, Re have carried out a study by in situ EXA FS of a reforming catalyst Pt-Sn/Al2O3-Cl. On one hand, on oxidised ca talyst, we have evidenced the formation of [PtOxCly] oxide and the pro ximity of platinum oxides and tin oxides. On the other hand, on reduce d catalyst, in situ EXAFS has shown that 20% of platinum is engaged in a PtSn alloy.